Final answer:
Horton's article focuses on the significant shortcomings found within rural mental health services accessibility, highlighting limited access and healthcare professional scarcity.
Step-by-step explanation:
Horton's article primarily addresses the shortcomings in rural MH service accessibility. This is evident as the article points out the various challenges faced by those living in rural areas, such as limited access to services, scarcity of healthcare professionals, and lack of appropriate facilities. The references cited, including the NIH publication and the HRSA report, focus on the particular issues of mental health services in rural America over an extended period, indicating that the problem is both significant and ongoing.
Furthermore, the reference to Snowden's research on barriers to effective mental health services for African Americans may also underscore disparities in access and quality of care that can be particularly pronounced in rural settings.